I did something like that and use it in my live setup.
It uses a CC on/off switch.
Off: no transposing
On: transposing on.
The initial transpose offset is taken from a slider and hence stored/recalled by Reaper.
If the first note on event after setting "on" is within the lowest two octaves of an 88 key keyboard, this note is not played, but sets the transpose offset.
(Moreover another on/off CC is used to optionally add a note one octave below the one played.)
-Michael
Last edited by mschnell; 06-15-2017 at 02:07 AM.
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